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Learned these in first year community college so they might be too advanced...or not. This first set of equations shows how to calculate investment growth.
Compound interest equation
P = C (1 + r/n)nt
Simplified compound interest
P = C (1+r)t
P = future value
C = initial deposit
r = interest rate expressed as a fraction, e.g. 0.04
n = # of times per year interest is compounded
t = number of years invested
This equation is more complicated but is used to calculate loans, such as mortgages.
B = A (1 + r/n)nt - P (1 + r/n)nt - 1 / (1 + r/n) - 1
B = balance after t years
A = amount borrowed
n = number of payments per year
P = amount paid per payment
r = annual percentage rate (APR)
t = number of years
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